High-binding-energy small polarons contradict stability condition for the l
attice. In magnetic semiconductors and manganites above the Curie point com
bined low-mobility magnetic-lattice polarons are possible. The free electro
n (hole) self-trapping occurs due to fluctuations of their spins following
the fluctuations of the local magnetic moment, and to the lattice polarizat
ion. (C) 2001 Published by Elsevier Science B.V.